Hacksaw frame with angularly adjustable handle



Feb., 26, 1957 A. R. GUNNERsoN 2,782,821

HACKSAW FRAME WITH ANGULARLY ADJUSTABLE HANDLE Filed Oct. l2, 1955INVENTOR.

United States Patent C) HACKSAW FRAME' WITH ANGULARLY ADJUSTABLE HANDLEArthur R. Gunnerson, Denver, Colo.

Application October 12, 1955, Serial No. 540,092

2 Claims. (Cl. 14S-34) This. invention relates to a hacksaw frame, and.has for its principal' object the provision of a simple, compact, andexceedingly eflioient frame for supporting and applying tension tohacksaws of any of the standard lengths.

Another object of the invention is to provide a hacksaw frame which willbe quickly and easily adjustable for holding a hacksaw blade in either aposition parallel to the frame or at an acute angle to the frame,depending upon the type of sawing to be done.

A further object i-s to provide means in a hacksaw frame for supportingthe saw in a solid non-rotatable position so that it may be accuratelyguided while sawing.

Other objects and advantages reside in the detail con- -struct-ion ofthe invention, which is designed for simplicity, economy, and eiciency.These will become more apparent from the following description.

In the following `detailed description of the invention, reference ishad to the accompanying drawing which forms a part hereof. Lik-enumerals refer to like parts in all views of the drawing and throughoutthe description.

In the drawing:

Fig. 1 is `a side View of one arrangement of the improved hacksaw frame;

Fig. 2 is a similar view of a second arrangement of the improved hacksawframe;

Fig. 3 is a cross-section through the frame and saw, taken on the line3-3, Fig. l;

Fig. 4 is a similar crosssection, taken on the line 4 4, Fig. 1; and

Fig. 5 is :a -side elevational view of the handle of the sawdisconnected from the frame assembly.

The improved hacksa-w frame comprises a substantially straight,elongated frame member of channel-shaped cross-section having the openside of its channel facing downwardly. An L-shaped `frame lever 11,having a substantially Vertical leg and a substantially horizontal leg,is tted into the channel of the frame member 10 and is hingedly mountedtherein on a hinge rivet 12, The hinge rivet 12 extends through the twosides of the channel of the frame member 10 and through the forwardextremity of the horizontal leg of the fname lever 11.

The rear extremity of the frame mem-ber 10 is widened, as indicated byan offset 13, to receive the upper extremity 14 of a handle 15. Theupper extremity of the handle passes between the two sides of thechannel of the frame member 10 and is hingedly mounted therebetween upona suitable handle rivet 16. The handle 15 can be swung about the axis ofthe rivet 16 from the position of Fig. 1 to the position of Fig. Zandlocked in either position or in any intermediate position by means of aclamp bolt 17 provided with a suitable wing nut 18. The clamp bolt 17passes through an arcuately elongated opening 19 in the upper extremity14 of the handle 15 to allow angular adjustment of the latter.

The frame lever 11 is supported from a jackscrew 20 which extends downthrough the top of the frame member 10 between the two sides thereof andis threaded through a cylindrical nut 21 which is rotatably mountedbetween ICC to the frame lever 11 by means of suitable rivets 23 and`extend rearwardly therefrom in oppositely offset, parallel relation toengage reduced extremities 24 formed on the nut 21.

The lower extremity of the frame lever 11 is provided with a stud pin 25for receiving one extremity of a conventional hacksaw vblade 26. Theother extremity of the hacksaw blade 26 is supported from an adjustableL- shaped bracket member 27 which is also provided with a stud 28 forreceiving the other extremity of the hacksaw blade 26. The lowerextremities of the frame lever 11 and the bracket member 27 are offset.sidewardly to place the saw blade on the center lines of the lever andbracket for accurate saw-ing use. The portions of the lever and bracketwhich contactA the saw are accurately attened so that the saw is rigidlymaintained in the plane of the frame to increase the sawing accuracy.

The adjustable bracket member 27 consists of a substantially verticalleg extending upwardly and rearwardly from the forward extremity of theha-cksaw blade, and a substantially horizontal leg extending rearwardlyinto the channel of the frame member 10. The horizontal leg of thebracket mem-ber 27 i-s provided with a plurality of adjustment notches29 in its lower edge which engage over a locking pin 30 positioned inthe forward extremity of the frame member 10.

The jackshaw 20 Iis provided with an enlarged head 31 supported on afriction washer 32 from the widened rear portion of the frame member 10.A compress-ion spring 34 surrounds the jackscrew 20 between the framemember 10 and the nut 21 and acts to constantly urge the rear extremityof the lever 11 downwardly. A handle clip 33 extends upon two sides ofthe head 31 where it is tiltably secured upon the extremities of a hingerivet 35 extending through the head 31. The handle clip is formed in anL- shape so that when not in use it will lie alongside the frame member16, as shown in full line in Fig. 4 and so that, when in use forrota-ting the jack-screw it may be lifted to an accessible position asshown in broken line in Fig. 4.

ln the arrangement illustrated in Fig. 2, the L-shaped bracket member 27of Fig. 1 is replaced by a straight bracket member 36 provided withadjustment notches 37 which engage the pin 30 of the frame member 10,similarly to the notches 29 previously described, and with -asaw-receiving stud 38 similar to the stud 28 of Fig. l. The straightbracket member is offset laterally so that when a saw blade is in placethereon, it will lie in the medial plane of the saw frame.

When placing a saw blade in the improved frame, the jackscrew 2i) isrotated to lower the rear extremity of the frame lever 11 and theforward extremity of the bracket member 27, or the bracket member 36, islifted to reelase it from the pin 30. The bracket member is then drawnforwardly to the fullest extension possible with the saw length beingused and relocated on the pin 36. The saw blade 26 is then placed overthe studs 25 and 28, or 38 if the bracket member 36 is being used, andthe jackscrew 20 is tightened. This swings the vertical leg of the lever11 rearwardly and places the saw in tension for sawing purposes.

If the saw is to be used in the position of Fig. 1, the wing nut 13 isloosened and the handle is swung rearwardly and clamped in the positionof Fig. l. If the saw is to be used in the position of Fig. 2, thehandle 15 is adjusted forwardly and clamped in the position of Fig. 2.Thus, the angular relation between the handle and the saw blade is thesame in both positions so that a uniform balance is maintained foraccurate and eicient sawing purposes.

While a specific form of the improvement has been described andillustrated herein, it is desired to be understood that the same may bevaried, within the scope of the appended claims, without departing fromthe spirit of the invention. p

Having thus described the invention, what is claimed and desired to besecured by Letters Patent is:

1. In a hacksaw frame having a frame member provided with a handle andmeans for securing a hacksaw blade in a desired angular relation to saidframe member, means for varying the angular position of said handlerelative to said frame so that the relative angular position betweensaid saw blade and said handle may be maintained regardless ofvariations in relative position be tween said saw blade and said framemember. Y

2. Means for varying the angular positions between a hacksaw framemember and a handle for said frame member as described in claim 1comprising: a channel formed in said frame member; a handle extremitypositioned in said channel; a hinge pivot member extending through saidframe member and through said extremity;

a clamp bolt extending through said frame member and through saidextermity, the latter being provided with an arcuately elongated slotfor receiving said bolt to allow swinging movement of said handle; a nuton said bolt acting to close said channel on said extremity to clamp thelatter in Xed position; and a handle mounted on said handle extremity.

References Cited in the le of this patent UNITED STATES PATENTS 802,290Holmes Oct. 17, 1905 1,471,214 Sieben Oct. 16, 1923 1,531,131y PriceMar. 24, 1925 2,606,585 Collura Aug. 12, 1952 2,612,920 Williams Oct. 7,1952 FOREIGN PATENTS 68,920 Sweden Nov. 29, 1927 487,814 Germany Dec.16, 1929

